The Ministry of Defence will be conducting a large-scale military exercise in southwest Scotland.
The exercise will involve helicopters and around 1,500 troops. Operation Joint Warrior will go on until 15 April.
Talks are taking place this afternoon which could decide the future of 300 jobs at two munitions depots.
The Ministry of Defence wants to shut the sites in Longtown in Cumbria and Eastriggs in Dumfries and Galloway.
A delegation of trade union and Cumbria County Council members are travelling to London to meet the new Defence Minister, Phillip Dunne to try and persuade him to keep them open.
Dumfriesshire Clydesdale and Tweeddale MP David Mundell took time out from the Conservative party conference to speak to our cameras about how important a decision this is for the area.
The Minister for Defence Equipment, Support and Technology Peter Luff has visited the MOD site at Longtown, north of Carlisle, to discuss the potential closure of the site and its sister facility in Eastriggs in Dumfries and Galloway.
The Joint Trade Unions says closing the munitions sites would put the supply to the front line at risk. Around 300 jobs could go if they close. Both sites are said to require significant investment if they are to be maintained.
The head of one of Britain's biggest trade unions says he's hopeful that 300 jobs can still be saved at a Ministry of Defence site in the region. The base in Longtown is threatened with closure as part of cost cutting measures.
The General Secretary of the Prospect Union met staff and said that the chances of saving the site have improved, but they still have a fight on their hands.
The general secretary of the Prospect Union has been in the region, discussing the future of the MOD site in Longtown.
The munitions processing site is due to close in 2014 as part of military cost cutting measures.
As well as the loss of 300 jobs, the union claims that closing the site would have a detrimental affect on supplying front line troops with ammunition.